The 20-year-old singer -- whose own "baby" (more like new album) drops July 23, welcomed the little bundle of joy into her life last Wednesday, as her mom Mandy Cornett Teefey gave birth to her first child with husband Brian Teefey.

Last night, Gomez revealed that the new addition to the family shall be named Gracie Elliot Teefey:

Momma, Brian, and me are all so grateful for all your well wishes. My lil sissy Gracie Elliot Teefey was born on June 12th. Luv you all XO

Gomez first announced her mom was pregnant on Mother's Day. She posted a photo of her touching her mom's growing belly to Twitter with the caption, "Hope all the amazing moms had a great day! I have the best momma in the world :)) I love you so much!"